Hardcoreware posted a review on the 2 TB Seagate Barracuda XT with 6 Gbps SATA 3.0

Check out our full review to find out of the XT really benefits from SATA 3.0 connectivity, and how it performs on standard 3 Gbps SATA 2.0 in comparison. We also put it up against the drive it has supplanted as Seagate's top-end desktop drive: The 1 TB Barracuda 7200.12. They are more similar than you would expect, so it makes for an interesting review.

2 TB Seagate Barracuda XT with 6 Gbps SATA 3.0 Review